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本文对确定土壤水力学特性的田间瞬时剖面法（直接方式）和室内土样法（间接方式）的试验结果进行了分析，对比了由这两种方法确定的壤质土壤的水力学特性参数和函数，并利用文中采用的数学模型对所求出的参数和函数进行了田间模拟验证．在此基础上，阐述了这两种方法各自的特点和内在局限性．整个分析计算结果表明，由田间瞬时剖面法确定的土壤水力学特性参数和函数要比室内土样法获得的结果具有较高的精度，更适宜用来准确地描述土壤非饱和区域内水分运移的分布，而当单独使用室内土样法确定田间土壤水力学特性时需持谨慎态度
In this paper, the experimental results of instantaneous profile method (direct method) and indoor soil sample method (indirect method) for determining soil hydraulic characteristics were analyzed. The hydraulic parameters of loamy soil determined by these two methods were compared with Function, and using the mathematical model used in the article of the parameters and functions obtained by field simulation. On this basis, the characteristics and inherent limitations of these two methods are expounded. The results of the whole analysis show that the parameters and functions of soil hydraulic properties determined by field transient profile method are more accurate than those obtained by indoor soil sample method and are more suitable for accurate description of soil moisture transport in unsaturated zone , And caution should be exercised when using indoor soil sampling alone to determine field soil hydraulic properties